LTE World Summit 2012 Day 1 T2 Remi Thomas FRANCE TELECOM


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LTE World Summit Barcelona May 2012

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LTE World Summit 2012 Day 1 T2 Remi Thomas FRANCE TELECOM

  1. 1. France Telecom Orange LTE EPCStrategyOvercoming the technical challenges Rémi Thomas Director of the LTE EPC Programme in FT/Orange. May 2012
  2. 2. Agenda 1 Drivers for an LTE/EPC launch 2 Some technical items 3 Some hints about the LTE/EPC launch roadmap2
  3. 3. 1 2 3 Drivers for an LTE/EPC launch3
  4. 4. 3G development is continuing3G+ coverage is becoming the standard in Europe Orange Mobile Networks in Europe: situation end of 2010 population 3G+ coverage % of network HSDPA/HSUPA enabled Yoy mobile data traffic growth Orange Poland 59% 100% X 2.4 Mobistar 90 % Orange Slovakia 100% 69% X 1.2 100% X 1.8 Orange France 95 % Orange Moldova 100% 76% X 2.3 100% X 2.2 Orange Spain Orange Romania 90% Orange Switzerland 52% 100% 94 % 100% X 1.8 ~ 90% X 1.5 X 1.9 Services are delivered through a consistent utilisation of a single technology family: GSM, EDGE, 3G (UMTS phase 1), HSDPA, HSUPA and HSPA+. 4 LTE EPC is our next technical step.
  5. 5. The trials confirmed the expected performance of LTE/EPC Higher throughputs at the radio interface Shorter response time Radio interface Throughput for a single user with a 20 MHz channel: – Downlink in the optimal radio conditions: 100 Mbps – Uplink in the optimal radio conditions: 30-50 Mbps – Downlink at the cell edge: 3 to 9 Mbps Cell Capacity taking into account the different radio conditions with a 20 MHz channel – Around 40 Mbps downlink can be shared between the different users utilising simultaneously the radio resource of a given cell equipped with a 20 MHz channel. LTE can deliver a very low latency experience – This enables even the most demanding applications such as online gaming Idle to Active transition time – To provide many users with an ‘always-on’ experience, LTE is designed with a low idle to active transition time (100ms). – All UEs sit in an idle state when there is no data to transfer – but can be activated quickly when they need to communicate.5
  6. 6. LTE/EPC is the next step of the GSM/UMTS mobile networks evolution. It is compatible with GSM/UMTS. It is an all IP mobile with a packet domain only 2G 3G LTE Core packet packet only, Packet only no circuit mode network packet No more RNC circuit circuit New radio interface, with various bandwidth (typically 5 MHz, 10 MHz, 20 MHz) RNC Support of FDD and TDD Access BSC LTE eNodeB Improved efficiency compared to 3G network BTS nodeB (high throughput UL&DL, lower latency, higher cell capacity), providing tens of Mbps for a 20 MHz channel Specified in many frequency bands It is the natural evolution for the GSM/UMTS world; it has been selected by IS95 operators as well Backward terminal compatibility; multi modes operation selection/reselection and handover between LTE and 2G/3GLTE launch will not be driven by a “killer application” but it will essentially be driven bycapacity needs. 6LTE will as well improve the customer experience.
  7. 7. 1 2 3 Some technical items - Voice for the LTE/EPC subscribers - QoS features - Self Organising Networks - Roaming - Devices7
  8. 8. Delivering voice to LTE customers 1/5 CSFB Architecture Overview II I Voice over CS – Initially camping under E-UTRAN, when phone calls, they are transferred to 2G/3G CS CSFB requires the UE to be combined-attached to EPC and CS through SGs – Similar to GPRS/IMSI Attach procedure When falling-back to 2G/3G CS for voice, DATA sessions (if available) are also transferred to 2G/3G PS, then re-transferred to EPC once the call is released CSFB includes VOICE, LCS and USSD (and not only VOICE.) – And SMS over SGs feature should be used. Since CSFB requires combined-attach and combined TAU/RAU operators should be careful on how to distribute the TAs and LAs8
  9. 9. Delivering voice to LTE customers 2/5 Solution for the launch and for roaming: CS Fallback (CSFB) – UE is registered on LTE/EPC and on 2G/3G network (combined update) – when receiving (or setting up) a call, UE handoffs to 2G/3G to establish a CS call on 2G/3G – SGs interface required between MSC and MME (like the Gs between SGSN and MSC) to do combined location update, paging and HO signalling between MME and MSC (also used for SMS) – data session is also transferred to 2G/3G network (possible decreased bitrate) or is dropped Target Architecture: VoIP managed by IMS and SRVCC to ensure service continuity9
  10. 10. Delivering voice to LTE customers 3/5 Why IMS for LTE voice? VoIP is the only solution to support voice over LTE/EPC – because there is no Circuit Switched (CS) domain on LTE/EPC IMS is the recommended VoIP solution to support voice over LTE/EPC because – only standard solution – allows handover to 2G/3G CS domain (SR VCC) – allows development of new multimedia services and convergence with other access networks10
  11. 11. Delivering voice to LTE customers 4/5 IMS challenges for voice over LTE Although most of relevant features will be defined in 3GPP R9/R10, still a lot to be defined/agreed for proper interworking – OneVoice, Voice over LTE project in GSMA Managing the E2E QoS of IMS voice over LTE/EPC is completely different (and more complex) than CS voice Migration of current CS services to IMS domain – Supplementary services, IN services … – consistency of voice service from user experience point of view on different access networks Complexity and performance of SR VCC11
  12. 12. Delivering voice to LTE customers 5/5 A summary VoIP is to be steered by IMS, with efficient use of radio resources and IMS-enabled support of advanced services. target IMS is the target solution for real time convergent services. architecture Challenge: migration of existing features/services which are delivered today by a cs based infrastructure At the border of LTE coverage, SR-VCC will provide hand-over handover to 2G and 3G coverage by same operator International roaming with 2G-3G networks is warranted roaming All LTE terminals will be multimode terminals, therefore at least benefit from voice service on legacy networks Fall back on 3G network for voice, as standardized by 3GPP (use of CSFB) according to the NGMN Recommendation migratory This will be the first solution to deliver voice service to the LTE solution subscribers; Challenge: Challenge ensuring an acceptable call establishment delay and avoiding impacts on the data services.12
  13. 13. QoS management, QoS features 1/3 QoS management on LTE/EPC: service and user differentiation is natively possible – QoS management features and equipment, are natively standardised for LTE/EPC networks, which was not the case for 3G. – QoS management is performed at core network level; handset role is only to accept network commands. – As a consequence, service and user differentiation can be implemented from the first commercial launches. Basic Quality of Service – LTE- EPC system is able to handle single or multiple simultaneous Guaranteed Bit Rates (GBR) & Maximum Bit Rates. – When necessary, throughput of non-GBR bearers will have to be sacrificed. In case of severe congestion, when some GBR services have to be deteriorated, the system starts with those having the lowest Allocation & Retention Profile.13
  14. 14. QoS management, QoS features 2/3Tests results of Basic Quality of Service features 6 LSTI Trials in both FDD & TDD have demonstrated that the LTE- EPC system is able to handle single or multiple simultaneous Guaranteed Bit Rates & Maximum Bit Rates. GBR setting can be successfully maintained. When necessary, throughput of non-GBR bearers will have to be sacrificed. In case of severe congestion, when some GBR services have to be deteriorated, the system starts with those having the lowest Allocation & Retention Profile. Throughput (Mbps) QoS differentiation in UL UE1 UE2 UE3 UE4 1 -All UEs with default bearer 2 -UE1 with GBR (7 Mbps) 9 3 -All UEs with default bearer 8 4 -UE2 with GBR (7 Mbps) 7 6 … 5 4 3 1 2 3 4 2 1 0 0 100 200 300 400 500 Time (s)14
  15. 15. QoS management, QoS features 3/3Examples of possible QoS management strategies on LTE/EPC networks No QoS differentiation, as on legacy networks : best effort QoS whatever the service and the user and no “QoS differentiated” offers proposed to our customers Even in this case, the question of maximum authorized bit rate is raised: maximum offered by LTE technical capabilities (max. bit rate in downlink up to 100Mbits/s!) as in legacy networks or application of a different maximum bit rate? Light QoS differentiation : put different priorities and Maximum Bit Rates on different services and/or users to protect statistically these sessions in case of congestion Example: higher priority and bit rates for premium users Advanced QoS differentiation : implement guaranteed QoS for some specific services and/or users and use it as a differentiator in the offers Example: guaranteed QoS for Voice over IP or streaming services for ensuring a very good quality on this type of services, even in case of congestion Choices shall be performed by each operator.15
  16. 16. SON Features Self-Organizing Networks SON features allow to automate some Network functions and some OA&M functions SON functions can be activated during: Network Deployment Self-configuration features: Plug & Play eNodeBs Automated PCI Configuration : Automatic configuration of the Physical Cell IDs Automatic Neighbour Relation management - ANR : Allowing ENodeBs to build and to maintain neighbour relationships Network Operations – Self-Healing (i.e. auto-repair) Network Optimization; some examples: – Mobility Load balancing optimisation – RACH Optimisation – Coverage and capacity optimization – … It will be indispensable to test and optimise these features before we could16 be able relying on them
  17. 17. Implementing roaming in the LTE/EPC networks 1/2 The first step will consist in providing roaming for the data only services – The relevant 3GPP specifications and GSMA deliverables have been completed. – New nodes shall be deployed in the Core Networks Then CSFB voice will utilise both the present 2G/3G roaming and the LTE/EPC roaming. Then VoLTE will be implemented according to the GSMA deliverables – IR92 (UE to IMS core interface) – IR88 (LTE roaming) – IR65 (IMS roaming) These specifications shall allow an handling specific to the voice service and distinct from the data services17
  18. 18. Implementing roaming in the LTE/EPC networks 2/2 LTE roaming architecture for data services A Diameter Edge Agent is required to route signaling between PLMN A combined HLR/HSS is required to cope with authentication and mobility in LTE/3G/2G PDN Gw is required because a GGSN does not support S818
  19. 19. LTE Devices All LTE devices shall comprise at least: – GSM/EDGE on 4 bands – UMTS/HSPA on 3 bands – And LTE on some bands: -> The first implementations should include at least 4 bands for LTE - Bands 3 (1800 MHz), 20 (800 MHz) and 7 (2600 MHz) are indispensable for the LTE roaming in Europe - World roaming will be in some cases ensured by fall back on UMTS/HSPA - More than 4 LTE bands shall be implemented in a near future -> High frequency bands = capacity in the urban areas -> Low frequency bands = improve coverage (rural areas, indoor coverage) We need LTE devices implementing CSFB voice according to the options recommended by NGMN Then the LTE devices shall implement VoIP in a near future – This implementation shall be compliant to the 3GPP specifications and to the VoLTE requirements outlined in the GSMA deliverables The devices shall support the SON features (e.g. ANR and MDT)19
  20. 20. 1 2 3 Some hints about the LTE/EPC launch roadmap20
  21. 21. Spectrum auctions planning Luxembourg* UK Q2 2012 Poland 2013 Q2 2012 H1 2013 2013 Slovakia H1 2013 Belgium H1 2012 Q3 2012 H2 2012 Done Q3 2012 Moldova** ? 2012 France Done Romania Done Jul 2012 Done Jul 2012 Spain Portugal Done Done Done Done Armenia Done Done spectrum trading Done 2013 Egypt 2013 Done 2.6 GHz 800 MHz 1.8 GHz 900 MHz 2.1 GHz Band free to use after auction* Beauty contest Band still partially occupied** Administrative assignment after auction April 2012
  22. 22. Tasks towards a commercial launch The spectrum allocation schedule allows some deployment in 2012 We depend on the spectrum allocations schedule; in addition we want to ensure first time right and leverage the LTE efficiency to improve customer quality and decrease cost to serve As a consequence different tasks shall be completed before an LTE/EPC commercial launch Radio Aspects – Optimisation – SON features Interworking between the LTE EPC network and the legacy networks (2G and 3G). – 3G/LTE features shall be tested and optimised Services migration – SMS services which shall be available from Day 1 using SMS over SGs – Voice service: CSFB; target solution will rely on IMS/SRVCC Implementing the QoS differentiation features; ensuring End to End QoS Marketing and economic requirements will drive commercial launch. The main driver for LTE commercial launch is still the need of network capacity for mobile22 data.
  23. 23. Some achievements and plans for the near future Orange Moldova deployed an LTE trial network which covers Chisinau, the Capital City of the country. – This network delivers to friendly testers the end to end performance (throughput, latency) expected from the LTE technology. – The commercial launch will be possible as soon as the licence is awarded. The auction process for the 800 MHz and 2600 MHz bands has not yet been launched in UK and will not conclude until 2013 Q1/2 In the mean time EE aim to start roll out using LTE 1800 to provide service in 2012 – Clearance from OFCOM regarding the use of 1800 MHz for LTE is awaited Orange France are rolling out LTE23
  24. 24. For their contributions to my presentation, it is my pleasure to thank some colleagues of mine : Yves BELLEGO Frédéric BONNIN Serge DANAN Laurent DUBESSET Nathalie JOLLIVET24
  25. 25. graziegracias Dziękuję mercidanke obrigado thank you 25